效果图：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <fragment
        android:id="@+id/fragmentTitle"
        android:name="com.example.beck.test.FragmentDemo.TitleFragment"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <fragment
        android:id="@+id/fragmentContent"
        android:name="com.example.beck.test.FragmentDemo.ContentFragment"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@id/fragmentTitle" />
</RelativeLayout>

MainActivity.java:

public class FragmentAty extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_fragment);
    }
}

ContentFragment.java:

public class ContentFragment extends Fragment {
    private ImageButton imgbtn;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.contentfragment,container,false);
        imgbtn= (ImageButton) view.findViewById(R.id.imgbtnWeichat);
        imgbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getActivity(),"I am ImageButton in TitleFragment !",Toast.LENGTH_SHORT
                ).show();
            }
        });
        return view;
    }

}

fragment_content.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <ImageButton
        android:id="@+id/imgbtnWeichat"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@mipmap/weichat"/>
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center"
        android:text="使用Fragment做主面板WeiChat"
        style="@style/TextViewStyle" />

</LinearLayout>

TitleFragment和其布局省略